Recording and reproducing apparatus



M ay 8, 1934 w, 5, FRlDELL I 1,957,584

RECORDING AND REPRODUCING APPARATUS Filed Aug. 6. 1931 INVENTOR .14 J?in;

BY A? ATTORNEY 765;? [Mum 1 50 In the present Patented May 8,- 1934RECORDING AND BEPRODUCING APPARATUS Willis s. Fridell, Washington, D.0., assignor to Thomas A.'Edison,

Incorporated, West Orange,

N; L, a corporation of New Jersey Application August 6, 1931, Serial No.

Claims. (01. 274-34) This invention relates to recording or reproducingmechanism and more particularly to recording or reproducing mechanismadapted to be used on cylinder phonographs such, for example,

5 as any oi the well known makes of dictating machines.

It is an object 0! this invention to provide mechanism or the classdescribed which is so constructed and arranged that considerable varia-19 tion in the size of records being used may be permitted withoutinterfering with the eiiiciency of the recording or reproduction;

It is a further object of this invention to provide apparatus of theclass described inwhich the effect oi the record being out of round orother irregularities in therecord are 'tially decreased.

"Itis still a further object of this invention to provide apparatus ofthe class described which shall be simple, rugged and unlikely to getout of order.

Still other objects and advantages of my invention will be apparent fromthe specification.

The features of .novelty which I believe to be characteristic of myinvention are set forth with particularity in the appended claims. Myinvention itself, however, both as to its'fundamental principles, and asto its particular embodiments, will best be understood by reference tothe specification and accompanying drawing, inwhich Fig. 1 is a sideelevation view of apparatus in accordance with my invention, and

Fig. 2 is an end elevation view thereof.

Referring now more particularly to the draw 1 indicates generically anelectrical recording or reproducing unit, which may be of any desiredtype arranged to cause vibrations of the armahire 2 in response to voicecurrents supplied to v the unit or conversely to reproduce voice currentwhen the armature 2 is vibrated by the record. The precise form or typeof telephone unit employed iorms perse no part of this invention and, infact, it will be understood that my invention lends itselr equally wellto the mechanical type oi recorder or reproducer utilizing a sound boxand diaphragm.

arrangement the telephone unit 1 is mounted by means of spacing blocks 4upon the carriage 5 oi the phonograph which carriage, as will beunderstood, moves with reference to the record 8.

The carriage 5 is provided with an extension substan- 6 to which issecured a downwardly projecting bearing block '7 having portions of itslower extremity cut away to define the bearing arms 9 and 10, the saidextension 6 and block 7 constituting a support for a floating weight 11.This floating weight terminates in cars 11a and 11b and is pivotallymounted upon pivots 12 and 13 carried by the arms 9 and 10 respectively,whereby it will be observed that the floating weight 11 is free torotate about the pivots l2 and 13 as a centre and may therefore swing upand down freely to take care of due to various causes.

one end of the stylus bar 16. The opposite end irregularities in therecord To the opposite end of the floating weight 11 at point 15 thereis pivoted 14 carrying the stylus of the stylus bar 14 is connected tothe lower end of link 3 as by means of pivot 1'7 passing through 3 andthe end of stylus of the link 3 is the telephone unit, if an the lowerend of link bar 14. The upper end connected to the armature 2 ofelectrical unit is employed, or to the diaphragm if a sound box isemployed.

The pivot or point of connection between link 3 and stylus bar 14 ismade to coincide with the line of pivots 12 and 13, and while I haveshown the lower end of link 3 terminating in a forked portion, ofconnection may as the connection it will be understood that other formsbe employed it between the link 3 and the 35 desired so long stylus bar14 coincides with the line of pivots 12 and 13. The extension 6 '7 maybe and the bearing block drilled or otherwise provided with an openingto permit passage of the link 3. i

It will be seen that this construction permits 99 the floating weight 11rotate as a unit about changing the position of and .the stylus the axis12-13 without the link 3. At the same arm 14 to time, however, thestylus bar 14 is tree to rotate about pivot 15 in response ted to itthrough the to vibrations transmitlink 3 or in transmitting to the link3 vibrations impressed upon the stylus 16.by the record. The floatingweight 11, as will be understood, is provided with suflicient mass sothat it is'not moved by vibrations of sound frequencies, whereas itswings up and down to take care of irregularities Whilel have shown onthe floating weight 11 understood that this is that the pivot 15 may inthe record.

the stylus bar 14 pivoted at point 15, it will be merely diagrammaticand 101 be located at any suitable point upon the floating weight inaccordance with the conditions required to be met.

While I have shown and described certain pre- {erred embodiments of myinvention, it will be un- 11 derstood that modifications and changes maybe made without departing from the spirit and scope or my invention aswill be understoodby those skilled in the art.

I claim 1. In phonographic apparatus of the class described, asupport, afloating weight pivotally mounted on said support for rotation, a stylusbar having one end pivotally secured to said floating weight remote fromthe pivot thereof, a trans-.

lating device, and a link connected between said translating device andsaid stylus bar, the connection between said link and said stylus barbeing pivotal and on a line substantially coincident with the axis ofrotation of said floating weight.-

2. In phonographic apparatus 01 the class described, a support, afloating weight pivotally mounted on said support for rotation, atranslating device mounted on said support, and a stylus bar carrying astylus adapted to engage a record, said stylus bar being connected atone end to said floating weight and at the other end to said translatingdevice, and the connection between said stylus bar and said translatingdevice being pivotal and on a line substantially coincident with theaxis of rotation 01' said floating weight.

3. In phonographic apparatus of the class described, a support, afloating weight pivotally connected at one sideto said support, a stylusbar having one end pivotally secured to said floating weight at a pointoflset from the pivot thereof, a translating device, and a pivotalconnection between said translating device and said stylus bar on a linesubstantially coincident with the axis of rotation of said floatingweight.

4. In phonographic apparatus of the class described, a support, afloating weight pivotally connected to said support for rotation, astylus bar disposed beneath said floating weight and havlng one endpivotally secured to said floating weight on an axis laterally displacedfrom the axis of said floating weight, a. translating device, and apivotal connection between said translating device and said stylus baron a line substantially coincident with the axis oi said floatingweight.

5. In .phonographic apparatus of the class described, a support, afloating weight pivotally secured to said support, a stylus bar havingone end mounted on said floating weight at a point displaced from thepoint of connection of said weight to said support, a translating devicecomprising a vibratile member, and a link connected between-saidvibratile member and said stylus bar, the connection between said linkand stylus bar being pivotal and on a line substantially coincident withthe axis of rotation 01' said weight.

6. In phonographic apparatus 01 the class de scribed, a support, afloating weight pivotally secured to said support, a stylus bar havingone end mounted on said floating weight at a point displaced from thepoint of connection of said weight to said support, a translating devicecomprising a vibratile member mounted on said support, and a linkconnected between said member, and the tree end of said stylus bar, theconnectionbetween said link and said stylus bar being pivotal and on aline substantially coincident with the pivotal axis of said weigh 7 7.In phonographic apparatus of the class described, a translating deviceincluding a vibratile member, a stylus bar having astylus intermediateits ends, a swingable support for one end or said stylus bar, saidsupport having a high motional impedance to voice frequencies and a lowmotionai impedance to frequencies below the range of voice frequencies,and a connection between the. free end of said stylus bar and saidvibratiie member, said connection being pivotal and on a linesubstantiallycoincident with the axis of rotation of said swingablesupport.

8. Phonographic apparatus comprising a pivotally mounted floatingweight, a stylus bar connected to said weight at a point offset from thepivotal axis of the latter, and means for connecting said bar to atranslating device, said means having pivotal connection with said baron a line substantially coincident with the pivotal axis of said weight.

9. Phonographic apparatus comprising a translating device, a pivotallymounted floating weight, and a stylus bar pivotally secured to saidweight at a point offset from the pivotal axis of the lat ter, said barhaving pivotal connection with said translating device on a linesubstantially coincident with the pivotal axis of said weight.

10. Phonographic apparatus comprising a translating device, a pivotallymounted floating weight, a stylus bar, and a link, said barbeingpivotally connected at one end to said weight and at the other endto one end of said link, the other end of said link being connected tosaid translating device, the pivotal connection between said bar andsaid weight being offset from the pivotal axis of the latter and theconnection between said bar and said link being on a line substantiallycoincident with the pivotal axis of said weight.

-WILLIS S. FRIDELL.

